Export all user permissions from a SharePoint 2010 Site to CSV

One of the requirement came to me to list down or export all users available on the site to .CSV format in a particular site collection with the properties like
Group name, Permission Level, User id, Url, Item type (List, site, library) etc..
So below is the script to achieve the same.  Copy the code & save it in notepad with .ps1 extension & then run with powershell. (Dont forget to mention the url of site collection in the script)

function Get-SPUserEffectivePermissions(
    [object[]]$users,
    [Microsoft.SharePoint.SPSecurableObject]$InputObject) {
   
    begin { }
    process {
        $so = $InputObject
        if ($so -eq $null) { $so = $_ }
       
        if ($so -isnot [Microsoft.SharePoint.SPSecurableObject]) {
            throw "A valid SPWeb, SPList, or SPListItem must be provided."
        }
       
        foreach ($user in $users) {
            # Set the users login name
            $loginName = $user
            if ($user -is [Microsoft.SharePoint.SPUser] -or $user -is [PSCustomObject]) {
                $loginName = $user.LoginName
            }
            if ($loginName -eq $null) {
                throw "The provided user is null or empty. Specify a valid SPUser object or login name."
            }
           
            # Get the users permission details.
            $permInfo = $so.GetUserEffectivePermissionInfo($loginName)
           
            # Determine the URL to the securable object being evaluated
            $resource = $null
            if ($so -is [Microsoft.SharePoint.SPWeb]) {
                $resource = $so.Url
            } elseif ($so -is [Microsoft.SharePoint.SPList]) {
                $resource = $so.ParentWeb.Site.MakeFullUrl($so.RootFolder.ServerRelativeUrl)
            } elseif ($so -is [Microsoft.SharePoint.SPListItem]) {
                $resource = $so.ParentList.ParentWeb.Site.MakeFullUrl($so.Url)
            }
            # Get the role assignments and iterate through them
            $roleAssignments = $permInfo.RoleAssignments
            if ($roleAssignments.Count -gt 0) {
                foreach ($roleAssignment in $roleAssignments) {
                    $member = $roleAssignment.Member
                   
                    # Build a string array of all the permission level names
                    $permName = @()
                    foreach ($definition in $roleAssignment.RoleDefinitionBindings) {
                        $permName += $definition.Name
                    }
                   
                    # Determine how the users permissions were assigned
                    $assignment = "Direct Assignment"
                    if ($member -is [Microsoft.SharePoint.SPGroup]) {
                        $assignment = $member.Name
                    } else {
                        if ($member.IsDomainGroup -and ($member.LoginName -ne $loginName)) {
                            $assignment = $member.LoginName
                        }
                    }
                   
                    # Create a hash table with all the data
                    $hash = @{
                        Resource = $resource
                        "Resource Type" = $so.GetType().Name
                        User = $loginName
                        Permission = $permName -join ", "
                        "Granted By" = $assignment
                    }
                   
                    # Convert the hash to an object and output to the pipeline
                    New-Object PSObject -Property $hash
                }
            }
        }
    }
    end {}
}

$site = $gc | Get-SPSite  http://localhost:2015
$groups = $site.RootWeb.sitegroups
 foreach ($grp in $groups) {
 foreach ($user in $grp.users)
  {
   $user = $user.LoginName
   $webPermissions = $site | Get-SPWeb –Limit All | Get-SPUserEffectivePermissions $user
   $listPermissions = $site | Get-SPWeb –Limit All | %{$_.Lists | Get-SPUserEffectivePermissions $user}
   ($webPermissions + $listPermissions) | ConvertTo-Csv -NoTypeInformation | Add-Content -Path c:\perms.csv
  }
  Add-Content -Path c:\perms.csv -Value $justData -Encoding UTF8
}
$site.Dispose()



$gc | Stop-SPAssignment


Thanks,
Omkar